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<script>
	var arr = ['田梦林', '李超云', '毛先亿', '姚哥'];
	//可以通过下标得到数组项
	console.log(arr[1]);
	console.log(arr[2]);
	console.log(arr[3]);
	//超过了数组的下标,不会报错
	console.log(arr[22]);//undefined
</script>
